Here's a track of the SABLE-III high altitude balloon project launched on August 11, 2007.

This mission carried a Nikon digital camera to a maximum altitude of 117,597ft, capturing images every minute. More information about this project can be found at:

http://www.sbszoo.com/bear/sable/sable3.htm

This project used APRS to track and recover the payload.

http://en.wikipedia.org/wiki/Automatic_Position_Reporting_System